Thanks for all that replies.
The problem is that MAC (Mecium Access Control) protocol is usually implemented in firmware or hardware (it depends on chipset), so to change the MAC protocol I should have firmware source code, then modify it, and flash the oryginal firmware. The drivers (for Linux or other system) are one level higher in protocol stack, so I can only drive with it the exisiting MAC protocol (modify some MAC parameters, have access to drive some brotocol behaviours, etc.). My intension is to change the protocol so I must have the firmware source code in any way :-(.
I know that it is hard to get it, but maybe someone have it...(I promise, it will be used for educational purposes only).
Lastek